Panel condenser



Apr 27 w26 L A.A. KENT PANEL CONDENSER Filed May a. 1925 2 shams-,sheet 1 132 ATTORNEY.

Amal 27,1926. 1,582,826 A. A. KENT PANEL CONDENSER Filed May 8, "1925 2 sheets-sheet 2 IN VEN TOR.

#ik ATTORNEY.

Patented Apr. 27, V1926 ARTHUB'ATWATEB I-KENT, OF ARDMORE, PENNSYLVANIA.

PANEL CONDENSER.

Application led May 8, 1925. Serial N0. 28,808.

To all/whom, z't may'concem: y

Bel it known that I, ARTHUR ATWATER KENT, a citizenofthe United States, residing at Ardmore, county of Montgomery, and 5 State of Pennsylvania, have invented certain new and useful Improvements in Panel vCondensers, of which the following is a speciication.

My invention relates to variable electrical condensers of the plate type utilizable for variation of capacity or tuning of circuits, particularly circuits traversed by high frequency current or oscillations, as in radio systems.

In accordance with one of the features of my invention, the panel, plate or Wall of a radio receiving set is comprehendcd in or is ai component part of the condenser structure or unit; and more particularly, the rotor and stator elements of ,the condenser are secured independently of eachother to the panel, plate or Wall, and the position of the rotor and stator with respect to each other vis determined by the panel, plate or Wall and their respective attachments thereto.-

Further in accordance with my invention, the rotor, in a combination of the character aforesaid in which the panelis a component part of the condenser unit or structure, is carried by and overhung beyond a.l single bearing member secured directly to the panel and preferably independently of the statorsupporting structure.

Further in accordance with my invention, there is provided on the side of the panel opposite the rotor and stator a spring exerting thrust longitudinally of the axis of rotation of the rotor; more particularly, a floating or loosely mounted spring engaging the panel and a'knob or handle upon the rotor shaft for exerting a thrust upon the shaft in a direction from the rear toward the front of the panel; and more particularly, my'invention comprises a sprin so employed upon the front or outer side of the panel When the latter is a component partof a condenser unit or structure.

Further in accordance with my invention, the panel, plate or Wall may be common to or comprised in a plurality of condenser structures or units; and u on the panel, Wall or plate may be mounted other devices or elements of the radio set. Y

Further in accordance with my invention,

at right angles `to the `rotor axis, and more particularly, the axis of adjust-ment is disposed to one side of or does 'not intersect the rotor axis; more particularly, the center of gravity ofthe fstator preferably lies in or adjacent the axis about which the stator is adjustable, and the stator is preferably secured to its supporting member only at the axis of adjustment; and more particularly, the stator, so adjustable about the aforesaid axis, is mounted for adjustment longitudinally of the axis of the rotorand in a direction substantially parallel with .the planes of the rotor and stator plates.

My invention resides in apparatus of the character hereinafter described and claimed.

. For an illustration of one of the various forms m invention may take, reference is to be ha to the accompanying drawings, in which:

Fig. 1 is a horizontal sectional view, partly in plan, of a radio receiving set embodying my invention.

Fig. 2 is a vertical sectional View, partly in elevation,'taken on the line 2 2 of Fig. l.

Fig. 3 is a vertical sectional view, partly in elevation, onenlarged scale, taken on the line 3-3 of Fig. 1.

Fig. 4 is a rear end elevational view of condenser structure such as shown in Fig. 3, partly in section in the plane of the axis of rotatable adjustment of the stator element.

Fig. 5 is a vertical sectional view, partly in elevation, taken on the line 5 5 ofF ig. 4. Fig. 6 is a fragmentary sectional View, on

enlarged scale, of the rotor bearing member. Fig. 7 is an end elevational view of the sprin Y y Re erring to. the drawings, H is a housing -or cabinet having the bottom 1, the hinged cover section 2 and the cover member 3, upon which and the bottom member 1 are secured the members 4 and 5, to which is .secured by screws the front panel, plate or Wall member 7, preferably o sheet metal, as iiidiCated, and which is comprised Jor included in a plurality of condenser structures or units.

On the inner side of the plate 7 is the downwardly extending flange 9 secured, as

by spot Welding, to the plate 7.

Secured upon the ledge 8, as by bracket 10, is thel inductance or secondary winding ot a transformer L connected in the input circuit. of a radio frequency amplifier tube adapted to be inserted into the tube socket o, Whose base is secured to the ledge 8. Car

ried upon the ledge 8 by e bracket 11 is a radio frequency transformer rl`,'whose primary is in the anode circuit of the tube received in the socket o and whose secondary circuit is connected in the input circuit otl a detector tube Aadapted to be received in the socket Q11. In the anode circuit ot the last mentioned tube is included the primary ot the audio frequency transformer T1, Whose secondary circuit is in the input circuit of an-audio frequency amplitier tube adapted to be receivedA in the socket e?. In the anode circuit of the last mentioned tube is iucluded 'the primary ot' a second audio l'requency transformer T2, Whose secoi'idary' is in the input circuit of a second stage audio frequency amplilier tube adapted to be received in the socket o3, and in'whose anode circuit is connected as usual a telephone, loud speaker or other signal-translating instrument. rlthe tube sockets o1, lv2, yv3 and the audio frequency transformers T1, T2 are mounted upon a base 12 secured upon the ledge S.

(Jo-acting with the inductance or transformer secondary L land with the secondary of the radio frequency transformer T, respectirely, are the tuning condensers C and C1, each ot' a structure hereinafter described.

Heretofore it has been customary, particularly in theV manufacture ot radio receiving sets, to utilizexfor one or more ot 'the tuning condensers such as C and 'C1 a complete or selicontained condenser unit comprising a suitable support Vupon Which are carried both the rotor and stator elements, and the unit as such and Vso complete-in and ot' itself has been suitably attached or mounted upon the Wall or panel ot the cabinet containing the elements of a. receiving set.

ln accordance with one feature oit myinvention, however, l depart from this practice and build into each of the condenser structures or units the panel or Wall, such as 7, upon and to which are secured independently of each other the supports tor the rotor and s'tator elements.

The rotor or rotatable armature assembly ot each o'f the condenser-s comprises the parallel plates 7', which, in the example illustrated, are die cast integral with the hub 13 and the rotor shaft 14, it being understood, however, that these plates may be individual and suitably secured upon a shaft, such as 14.

The rotor comprising the plates i' is pro- `vided "with a single bearing member or Sleeve 15 having at its inner or treejend a conical bearing seat 16 for the conical bearing 17l 21 upon the member 15.

The knob or operating handle 22, ot bakelite or the like, has molded therein the mei tallic insert member 23, in which is received the. outer end of the shait 11 and which is secured to the shaft by the set screw 21. Integral with the knob *.22 is the dial 25, bearing graduations, with which coacts any suitable pointer carried by the panel 't'.

On the side of the panel T opposite to the rotor structure, that is, on the outsidev ot' the panel, is the free or loating spring 26 haring an aperture through which the shal't l-l loosely extends, and preferably bowed, as indicated, to engage at its outer ends the outer face of the panel 7, between which and the aforesaid insert Q3 it is contined.v ril`he action of the spring is such as to exert a thrust outwardly, that is, toward the left, Fig. 3, upon the shaft 141, thereby holding the conical bearing 17 snugly in the conical seat or bearing 16 in the single lbearing member 15, to the right or beyond which is overhung the rotor proper.

Secured to the inner side of the panel 'i' by any suitable means, as'spot uields 27, and independently of the rotor struc-ture and its support or 'bearing member 15, is the stator support comprising the member 28 having the rearwardly outstanding sides or arms 29.

The stationary armature assembly or stator ol" the condenser comprises the spaced parallel plates s, with which are adapted to interleayje the rotor plates r, as Well understood in the art. rl`he stator plates s may be held in a group or unit by any suitable means. ln the example illustrated, however, they are die cast integral with the oppositely disposed rside elements 30, 30, into which are threaded the Screwsl, 31 extending through apertures 3.4. Surrounding each screw 3l is an insulating bushing 33, and between each side member 30 and its .adjacent supporting arm 29 is an insulating Washer 34, and between each screw head and its adjacent supporting arm 29 is an insulating washer 35, the bushings and Washers Serring to insulate the stator from its` support.

The stator is in etleetpivoted or rotatably adjusted about an axis with which the longitudinal axes ot the screws 31 are coinci.

d'ent. rlhis axis of adjustment extends at right angles to 'the axis of the Ashaft let or the axis of rotation of the rotor, and is pref.

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erably spaced to one side of the rotor axis, whereby the two ases are non-intersecting. Furthermorepthe axis aboutwhich the stator structure is adjustable preferably extends through er adjacent the center of gravity ot' the stator, whereby when the latter is in desired adjusted position, and there held tight by the screws 31, it will have a minimum tendency to rotate about that axis due to jolts or vibrations applied to the apparatus as a whole. l

lV ith the screws 3l loose, the stator may be tilted or rotatably adjusted about the aforesaid axis for procuring substantial ,parallelism between its plates and those of the rotor structure. Furthermore, the apertures 82 in the supporting arms 2D are preferably elongated or partake of the form ot slots, as indicated in F ig. 5, to permit adjustment of the stator element as a whole longitudinally of the axisof rotation of the rotor.

lVith the screws 3l loose as aforesaid, and

suit-able templet er spacer members temporarily inserted between the stator and rotor plates when in interleaved position, the stator element is in eiiect adjusted to desired position, both as regards position longitudinally of the rotor airis and as regards adjustment about the axis of the screws orits pivotal supports '31, and the screws 3l may new be tightened and the templet or spacer members removed, and the stator will. then remain in proper adjustment with respect to the rotor, which during the aforesaid adjustment is in its operative position indicated with respect to its bearing member l5. lVhile it is my preference, as indicated, to support or secure the stator element solely at its aforesaid axis about which it is adjustable, it will be understood that it may be held supported by a greater number of screws or equivalents, provided, however, a sufficient play or clearance about such screws is provided topermit in effect the aforesaid adjustment about an axis at right angles to the rotor axis. Furthermore, the aforesaidv apertures 32 may be of sui'licient width vertically, Fig. 5, to permit also an adjustment, it desired, ot the stator element toward or away from the rotor axis in the direction of the planes of the stator and rotor leaves s and r to effect desired maximum capacity. i

From ythe foregoing description it is apparent that in accordance with one ot the features of my invention the main panel of a receiving set is included in and constitutes a part ot each ot the condenser structures or units whose rotor and stator elements are secured independently of each other and ot their supports to the panel, and the relative position of stator and rotor elements is determined by their respective attachments to their common panel. v

It is further apparent'that the panel, as 7,

upon which are mounted elements of the receiving set other than the condensers, 1s coni- Amon to and comprehended in and .is a part ot' a plurality of condenser units electrically related to other elements of the set. te

lVhatl claim is: l. A. radio set comprising a variable condenser unit, devices electrically associated therewith, and a metallic panel, said condenser unit supported solely on said panel 'Z5 and consisting of said panel and the rotor and stator condenser elements.

2. In a radio sei; comprising a variable condenserl unit and devices electrically associated therewith, a metal panel forsaid 8U set, and means' for holding the rotor and stator elements of said condenser unit in operativeA relation to each other comprising said panel. and means for securing said rotor and stator elements independently of S5 each other to said panel solely.

3. ln a radio set comprising a variable condenser unit and devices electricallyl associated therewith, a metal panel for said set, and metallic supports for the rotor 'and 90 stator elements of said condenser unit secured independently or' each other to said panel to thereby include said panel in "said condenser unit for determining the positions of said rotor and stator 'elements with 95 respect to each other, said condenser unit supported soely'onsaid panel.

4. ln a radio set comprising a variable condenser unit and devices electrically associated therewith, a panel for said set, sup- 160 ports tor the rotor and stator elements oi' 4 said condenser unit secured independently ot' each other` to said panel to thereby include said panel in A said condenser unit :tor determining the positions of said rotor and stator elements with respect to each other, said condenser unit supported solely on said panel and means forl supporting one or more of said electrically associated devices upon said panel. y lm 5. In a radio set'comprising a variable condenser unit and devices electrically associated therewith, a panel for said set, supports for the rotor and stator elements o`t said condenser unit secured independently 15' of each other to said panel to thereby include said panel in said condenserl unit for determining the positions of said rotor and stator elements with respect to veach other,

a ledge member secured to said panel, and m0 means. for supporting one or more of said electrically associated devices upon said ledge member.

6. In a radio set comprising a plurality ot variable condenser units and devices electrically associated therewith, a panel for said set, and supports for the rotor and stator elements of each of said condenser units secured independentlyof each other to said panel to thereby include said panel as an 1,30

element common to and comprehended in each. of said condenser units and tor determining the positions with respect to each other of the rotor. and stator elements ot each condenser unit, each of said condenser units supported solely on said panel.

7. rlhe combination with panel, of rotor and stator elements ot a condenser, supports for said rotor and stator elements secured independently of each other tosaid panel to form a condenser unit including said panel, and a spring on the opposite side ot' said panel from said rotor and stator elements effecting an axial thrust updu said rotor element. l

8. 'lhe combination with a panel, ot rotor and stator elements ot a condenser, supports for said rotorand stator elements secured independently ot each other to said panel to form a condenser unit including ysaid panel, and alloating sprintr on the opposite side oit said panel from said rotor and stator elements exerting an Aaxial thrust on said rotor element.

9.' The combination with a panel, ot rotor and stator elements or" a condenser, supports'- or said rotor and stator elements secured independently ot each other to said panel to .torni a condenser unit including said panel, a member :tor actuating the rotor element disposed on the opposite side or" said panel 'from saidl rotor element, l.and a floating spring on said opposite side o" said panel engaging said lpanel and thrusting on said actuating member axially of said rotor element.

10. ythe combination with. a panel, ot rotor and stator elements or a condenser, a single bearing member tor said rotor element secured to said panel and disposed. between said rotor element and said panel whereby said rotor element overhangs beyond said bearing member, means supporting said stator element upon said panel, and a spring on the side ot said panel opposite saidrotor element exerting an axial thrust on said rotor element against said bearing member.

11. rlhe combination with a panel, of rotor and stator elements of a condenser, a single bearing member forl said rotor element secured to said panel and constituting the sole support of said rotor element and disposed between said rotor element and said panel whereby said rotor element overhangs beyond .said bearing member, and means supporting said stator element upon said panel independently of the rotor support, said stator element supported solely on said panel.

12. The' combination with a panel of rotor and stator elements of a condenser, a single bearing member for said rotor element sei cured to said panel and constituting the sole support of said rotor element and disposed between said rotor element and said panel message stituting the sole support ot said rotor element, means supporting said stator element upon said panel, and a spring thrusting said rotor element against said conical bearing.

'14. The combination with a panel, of rotor and stator elements of acondenser, a single bearing member tor ,said rotor element secured to said panel and having at its end rei mote from said panel a conical bearing for said rotor element, said bearing member constituting the sole support of said rotor element, means supporting said stator element upon said panel, and a spring on the side of said panel dpposite said rotor element thrusting it against said conical bearing,

15. The combination with a panel, oi." rotor andI stator elements ot' a condenser, a single tubular bearing member for said stator element, said panel having an aperture, said bearing member extending through said aperture and having its end embracing said panel'at the edge ot said aperture, said bearing member constituting the sole support for said rotor element and disposed between said` rotor element and said panel whereby said rotor element oyerhangs beyond said bearing member, and means supporting said stator element upon said panel.

16. 'lhe `combination with the stator and rotor elements oit a condenser, or a iixed sup-- port, and a single bearing for said rotor element carried by said support and beyond `which said rotor element is overhung, means supporting said stator element on said support tor permit-ting'its adjustment about an axissubstantally at right angles to the axis. of rotation of said rotor element.y

17. rllhe combination with the stator and rotor elements of a condenser, of a :fixed sup port, and a single bearing for said rotor element carried bypsaid support and beyond which said rotor element is overhung, means supporting said stator element on said support for permitting its adjustment about an axis substantially at right angles to and spaced to one sideof the axis of rotation of H said rotor element.

18. The combination with the stator and rotor elements of a condenser, of a fixed sup-` port, and a single bea-ring for said rotor elep ment carried by said support; and beyond which said, rotor element is overhung, means 13 Supporting said stator element on said support for permitting its adjustment about an axis substantially at right angles to the axis a of rotation of said rotor element and in a rotor element is overhung, means supporting said stator elements on said support for permitting its adjustment about an axis substantially at-right angles to the. axis of rotation of said rotor element4 and in a direction substantially parallel with the planes of said plates.

20. The combination with rotor and stator elements of a condenser comprising substan` .tially parallel plates, of a fixed support, and

a single bearing for said rotor element carried by said support and beyond which said rotor element is overhung, means supporting said stator element on said support for permitting its adjustment in directions substantially parallel With the plane of said plates and substantially parallel With the axis of rotation of said rotor element,

21. The combination with a panel, of rotor and stator ,elementsof a -condenser, means for supporting said rotor element upon said panel, arms secured to said panel independently of said rotor-supporting means, and co-axial pivot members supporting said stator element and carried respectively b'y said arms.

` 22.-,The combination with a panel, of rotor and stator elements of a condenser, means for supporting said rotor element upon said panel, and means for independently supporting said stator element upon said panel comprising a supporting member having arms, and co-axial pivot members s upport- 'ing said stator element and carried respectively by said arms.

23..'The combination with a panel, of

rotor and stator elements of a condenser,"

means for supporting said rotor .element upon said panel; arms secured to 4said panel independently of said rotor-supporting means, and co-axial pivot members supporting said stator element and extending respectively through apertures in said arms per-- mittlng adjustment of said statorelement substantially parallel with the axis of rotation of said rotor element.

24. The combination with a panel, of rotor and stator elements of a condenser, means for supporting said rotor element upon said panel, arms secured to said panel independently of said rotor-supporting means, and co-axial pivot members supporting said stator element extending respectively through apertures in said arms perelement secured to said mitting adjustments of said'stator element about an axis substantially at right angles to the rotoraxis and in a direction substantially parallel with said rotor axis.

2 5. The combination with a' panel, of rotor and stator elements of a condenser comprising substantially parallel plates, means for supporting said rotor element upon said panel, arms secured to said panel independently of said rotor-supporting means, and co-axial pivot members supporting said stator element and extending 'respectively through apertures in said arms permittingadjustment ofv said stator element in directions substantially parallel with the axis of rotation of said rotor element and substantially parallel' with the planes oi said platea, i 26. The combination with a panel of rotor and stator elements of a condenser comprising substantially parallel plates,`

means for 'supporting said rotor element upon said panel, arms secured to said panel independently 'of said rotor-supporting means, and co-axial pivot members supporting said stator element. and extending respectively through apertures in said arms element secured tosaid panel-independently of said rotor-supporting means, and means carrying said stator element upon said support permitting its adjustment about an axis substantially at right angles tothe axis of rotation of said rotor element.

28. The combination. with a panel, of rotor and. stator elements of a condenser, means for supporting said rotor element upon said panel, a support for said stator panel independently of said rotor-supporting means, and means carrying said stator element upon said support permitting its adjustment about an axis substantially at right angles to and,dis placed to one side ot' the axis 'of rotation of said rotor element.

29. The combination with a panel, of rotor and stator elements of a condenser, means for supporting said rotor element upon said panel, a support for said stator element secured to said panel independently ot said rotor-supporting means, and means carrying said stator element upon said support permitting its adjustment about an axis substantially at right angles tothe axis of rotation of said rotor element and in a direction substantially parallel with said axis of rotation of said rotor element.

'plates 30. The combination with a panel, of rotor and stator elements of a condenser comprising substantially parallel plates, means for supporting sai rotor element upon said panel, a lsupport for said stator element secured to said panel independently of said rotor-supporting means, and means carrying said stator element upon said support permitting its adjustment in a direction sul)- stantially parallel with the planes of sald 31. The' combination with a panel., of rotor and stator elements .of a condenser compris ing substantiall parallel plates, means for supporting' sai rotor element upon Said panel, a support for said stator element secured to said panel independently of said rotor-supporting means, and means carrying said stator element upon said support permitting its adjustment in adirection substantially parallel withy the planes of said plates and about an axis substantially at right angles to the axis of rotation of said rotor element.

2@ 32. The combination with a panel, of rotor and stator elements of al condenser comprising,` substantially parallel plates, means for A supporting said rotor element upon said panel, a support for said stator element secured to said panel independently of said rotor-supporting means, and means carrying said stator element upon said support permitting its adjustment in a direction substantially parallel with the planes of said plates and in a direction substantially parallel Wit-h the axis of rotation of said rotor element.

33. The combination with a metallic panel, of rotor and stator elements of a plurality of condensers, metallic supports for said rotor and stator elements of each condenser secured independently of each other to and ,electrically connecting with said panel to forni a condenser unit including said panel, and means for insulating one-0f said condenser elements of each condenser from its said support-v, said condensers supported .solely on said panel which is included in the condenser units.

- ARTHUR ATWATER KENT. 

